Back Story

This SCP idea is about doorways to other realms of reality created by beings that were formally human with the help of Supernatural Powers and Science. The Beings serve a hierarchy of Supernatural and Paranormal beings and are the lowest tier of leadership in the hierarchy and only can control the Denizens within their realms. The beings that have created the realms are very powerful within the realms being that they can control the very nature of the realms with limits. How ever outside their realms the beings are extremely weak and can be taken down without issue how ever are not killed by normal means. The separate doorways to each realm are located in 14 different locations across the seven continents that have access to many other locations quickly or are extremely deprived of human population.

Foundation Role

The role of the foundation varies from location to location due to differentiating factors involved. But initially the role is to stop the denizens from breaking out or human citizens from breaking in. The only issues the Foundation faces is the Location in Australia and Argentina seeing as they're very public places. Chad can be explained as the Shaman Claims he did it whether its true or not the Foundation doesn't now at the time. With Argentina the workers are allowed to work on the sewers but are anesthetized every month they do so.
Your thoughts?

This seems kind of derivative of a lot of existing franchises, but the first one that comes to mind for me is the Secrets of the Alchemyst Nicholas Flamel series, which has immortals and gods/goddesses living in their own other realms and also being able to travel to the actual world, but are weakened by things like iron.

Overall, this just seems kind of not well thought-out and excessively grandiose, which could be a problem for maintaining suspension of disbelief.

The role of the foundation varies from location to location due to differentiating factors involved.

How did the Foundation manage to find all these locations to begin with?

Keep in mind that as the author, you know the entire story, but the Foundation needs to have discovered what it knows about the SCP object through observation and experimentation. You'll need to convince your reader that someone with no prior knowledge whatsoever of the anomaly managed to somehow figure out (not magically know!) all the information you've got in the article.

Furthermore, being physically weak doesn't equate to being dumb, so surely these beings from other realms would be smarter about keeping their doorways hidden when they need to use them?

The only issues the Foundation faces is the Location in Australia and Argentina seeing as they're very public places.

Not necessarily. The Foundation probably has enough resources to put some D-Class in with the normal population, and station some staff to keep an eye on things and direct people accordingly.

With Argentina the workers are allowed to work on the sewers but are anesthetized every month they do so.

I think you mean "amnesticized".

I don't know about this. Maybe it would work if the doorways were more instinctive and not as randomly scattered, and we had more of an idea of why these beings exist and what the point of them being on earth is. All you've got here is "they're super powerful, they can't be killed by normal means (so technically your "they're actually weak in our world" bit isn't really that much of a weakness if they can't be killed easily anyway), they have these doorways". That's kind of just generic monster fodder. What makes these things unique in their motivations, behaviors, and backstory?